The sanitary landfill process was developed to provide a means of disposal of wastes, particularly urban refuse and industrial solid wastes, in a manner that will not pollute the environment. In simple terms, this is accomplished by sealing the wastes to prevent interaction with the environment. Soil with low permeability provides the seal. The integrity of the seal is dependent upon the quality of the landfill operation, especially the cover soil compaction requirements. In a well-designed landfill, the movement of moisture and gas into or out of the interior of the landfill is significantly restricted to create a relatively closed environment for the wastes.